I was disappointed with how bad avr-gcc was at optimizing code. Here's one of several examples I found. https://nerdralph.blogspot.com/2015/03/fastest-avr-soft

I was disappointed with how bad avr-gcc was at optimizing code. Here's one of several examples I found. https://nerdralph.blogspot.com/2015/03/fastest-avr-software-spi-in-west.html https://nerdralph.blogspot.com/2015/03/fastest-avr-software-...